US Patent No: 5,001,752

Number of patents in Portfolio can not be more than 2000

Public/key date-time notary facility

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Abstract

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A time notarization apparatus and method is disclosed which uses a secure, microprocessor based hardware platform which performs public key cryptographic operations to obtain trusted time stamping with a minimum of intervention by third parties. The hardware platform is encapsulated in a secure fashion so that the device's timestamping mechanism may not be readily tampered with or altered. The hardware platform includes at least one digital clock and a stable, secure storage device to record the private half of a public/private key pair. Coupled to both the digital clock and the storage device is a data processing device which performs public key signature operations in a secure and tamper-proof manner. Only the processing device has access to the secure storage device and its associated private key. The hardware platform also includes input/output means which receives a digital message which is to be digitally signed and timestamped and which outputs the resulting timestamped signature generated by the device. The hardware platform also includes a power source, (e.g., an on-board battery) to ensure the accuracy of the device's digital clock and the security of storage data prior to installation or in case of a power failure.

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Patent Owner(s)

  • Assignment data not available. Check USPTO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fischer, Addison M Naples, FL 33 3191

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
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6,618,484 Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels 155 2002
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8,307,212 Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels 0 2003
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6,918,042 Secure configuration of a digital certificate for a printer or other network device 19 2001
7,890,765 Generating and verifying trusted digital time stamp 0 2008
 
MICROSOFT CORPORATION (11)
8,347,078 Device certificate individualization 0 2004
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8,781,969 Extensible media rights 0 2010
 
WALKER DIGITAL, LLC (11)
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6,263,438 Method and apparatus for secure document timestamping 83 1998
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CITIBANK, N.A. (8)
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7,478,239 Electronic ticket vending system 3 1999
7,269,256 Electronic-monetary system 35 2002
 
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7,500,272 Manufacturing unique devices that generate digital signatures 11 2001
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7,784,106 Manufacturing unique devices that generate digital signatures 0 2009
 
PITNEY BOWES INC. (7)
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INTEL CORPORATION (3)
6,389,537 Platform and method for assuring integrity of trusted agent communications 217 1999
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ROVI SOLUTIONS CORPORATION (3)
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KABUSHIKI KAISHA TOSHIBA (1)
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THALES HOLDINGS UK PLC (1)
7,650,508 Time stamping system 0 2002
 
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The United States of America as represented by the Secretary of Commerce (1)
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XEROX CORPORATION (1)
5,157,726 Document copy authentication 138 1991
 
Other [Check patent profile for assignment information] (10)
5,136,643 Public/key date-time notary facility 213 1990
5,150,407 Secured data storage devices 118 1991
5,422,953 Personal date/time notary device 153 1993
5,619,571 Method for securely storing electronic records 83 1995
5,936,149 Personal date/time notary device 15 1995
5,720,034 Method for secure key production 21 1995
5,748,960 Method and apparatus for validating travelling object-oriented programs with digital signatures 136 1996
6,105,072 Method and apparatus for validating travelling object-oriented programs with digital signatures 39 1997
6,408,388 Personal date/time notary device 27 1999
6,865,678 Personal date/time notary device 5 2002

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